Spaak, Piet Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;
https://doi.org/10.1007/BF00341348 (Publisher version)
Spaak, P. (1995). Sexual reproduction in Daphnia: interspecific differences in a hybrid species complex. Oecologia, 104(4), 501-507.